Vandecasteele Bart, Meers Erik, Vervaeke Pieter, De Vos Bruno, Quataert Paul, Tack Filip M G
Institute for Forestry and Game Management, Ministry of the Flemish Community, Gaverstraat 4, B-9500 Geraardsbergen, Belgium.
Chemosphere. 2005 Feb;58(8):995-1002. doi: 10.1016/j.chemosphere.2004.09.062.
The growth and metal uptake of two willow clones (Salix fragilis 'Belgisch Rood' and Salix viminalis 'Aage') was evaluated in a greenhouse pot experiment with six sediment-derived soils with increasing field Cd levels (0.9-41.4 mg kg-1). Metal concentrations of eight elements were measured in roots, stems and leaves and correlated to total and soil water metal concentrations. Dry weight root biomass, number of leaves and shoot length were measured to identify eventual negative responses of the trees. No growth inhibition was observed for both clones for any of the treatments (max. 41.4 mg kg-1 Cd, 1914 mg kg-1 Cr, 2422 mg kg-1 Zn, 655 mg kg-1 Pb), allowing their use for phytoextraction on a broad range of contaminated sediments. However, dry weight root biomass and total shoot length were significantly lower for S. viminalis compared to S. fragilis for all treatments. Willow foliar Cd concentrations were strongly correlated with soil and soil water Cd concentrations. Both clones exhibited high accumulation levels of Cd and Zn in aboveground plant parts, making them suitable subjects for phytoextraction research. Cu, Cr, Pb, Fe, Mn and Ni were found mainly in the roots. Bioconcentration factors of Cd and Zn in the leaves were highest for the treatments with the lowest soil Cd and Zn concentration.
在一个温室盆栽试验中，利用六种田间镉含量递增（0.9 - 41.4毫克/千克）的沉积物衍生土壤，评估了两个柳树无性系（脆柳‘比利时红’和柳条柳‘奥格’）的生长和金属吸收情况。测定了根、茎和叶中八种元素的金属浓度，并将其与总金属浓度和土壤水金属浓度进行关联。测量了干重根生物量、叶片数量和茎长，以确定树木最终的负面反应。对于任何处理（最高41.4毫克/千克镉、1914毫克/千克铬、2422毫克/千克锌、655毫克/千克铅），两个无性系均未观察到生长抑制，这使得它们可用于广泛的污染沉积物的植物提取。然而，在所有处理中，柳条柳的干重根生物量和总茎长均显著低于脆柳。柳树叶片中的镉浓度与土壤和土壤水镉浓度密切相关。两个无性系地上植物部分的镉和锌积累水平都很高，使其成为植物提取研究的合适对象。铜、铬、铅、铁、锰和镍主要存在于根部。在土壤镉和锌浓度最低的处理中，叶片中镉和锌的生物富集系数最高。
